Usually you would use fork and then use system, eval, exec, backquotes or other exotic ways.

from fork node :

    unless ($pid = fork) {
        unless (fork) {
            exec "what you really wanna do";
            die "no exec";
            # ... or ...
            ## (some_perl_code_here)
            exit 0;
        }
        exit 0;
    }
    waitpid($pid,0);
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But in you case I wonder if it's the best way...